Calipers



E. CICHY AND R. PESEK. CALIPERS. APPucATfoN FILED Nov. x2. 1920.

l 19435963@ Patented No M, 1922.

gnou-Ifo Edward -Eitzhg Rudnlf Pasek lPatented Nov. 14, 1922.

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' EDWARD erom AND RUDoLr rnsnx, bor. CHICAGO, IDLInors.

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Application led November 12, 1920. Serial No. 423,628.

vof Cook and State of Illinois, have invented certain new and useful Improvements in Calipers, of which the yfollowing is a specification.

This invention relates to improvements in adjustable calipers.

the provision of a pair of adjustable calipers adapted to accurately determine -by visible means any error which might exist in the dimensions of an object. v

A further object of the invention 1s the rovision of a pair of calipers in which it 1s merely necessary to set the same at a predetermined gage and the error between vthe set gage, and dimensions of an article will be visibly determined by an` indicator Yarm upon the caliper.

A further object of the invention is the provision of a caliper of the' above described character which is simple, easy of adjustment, and so compactly arranged 'as to present small opportunlty of any disarrangement of parts.

ln the accompanying drawings, forming la part of this specification, and in which like reference characters designate like parts throughout the same: Figure 1 is a side elevation of the 1mproved calipers showing the same registerin a determined gage.

igure 2 is a,` sideelevation of the improved calipers showing the method of dcter'mining a discrepancy from arequired a e, i g igure 3jY is an enlarged fragmentary elevation showing several details of construction of the improved calipers.

Figure 4 is an enlarged fragmentary elevation, showing some of the details disclosed in Figure 3, and at right angles thereto.

ln lthe drawings, wherein for the purpose of illustration is shown a preferred embodi- 'ment of our invention, the letter A designates a caliper, having the improved means B associated therewith for visibly determining an error in dimension from a required gage.

per leg 1()A having an engaging point' 11L upon one end thereoffor the purpose of en- The caliper A comprises an ordinary caliits dimension. AA second caliper leg 11 ie provided for cooperating with the caliper leg 10 and referably terminates short of the length of the caliper leg 10. The cali per legs 10 and 11 are preferably uniform 1n cross section, with the exception that the free end 12 of the caliper leg 11, is cut awayuponone side thereof thus reducing materially in cross section, the free end 1:3

i -of thecaliper leg 11, so that the plane of An important object of the invention 1s.

vat 15, inthe ordinary manner.; and in the form shown inthe invention, namely a caliper for measuring inside dimensions, the spring 16 is provided for en aging the caliper legs 10 and 11 Afor norma ly forcing them apart. An adjusting screw 17 is pivotally carried by they leg 10, as at 18 and engages a rivet 20 or the like, mounted upon the caliper leg 11, having the adjusting nut 21 mounted thereon and in engagement with the adjusting screw 17 for expanding or contracting the caliper legs 10 and 11. ll-iowever, it is to be understood that the improved visible means for determining a discrepancy in measurement, can be applied to an outside caliper as well, the appllcation of the principle together with the construction being the results sought.

JThe improved means B of visibly determining an error in dimensions comprises a supplemental leg or arm 25, pivotally mounted as by a .rivet 26 or the like, to the reduced end 12 of thefcaliper leg 11, and upon' the terminal of said leg.. The sup-I plemental leg 25 includes an indicator 26 extendin upwardly from the pivot 26 and. being re atively smaller in cross section vthan the cross section of the'caliper leg 11-for abutting the same upon the reduced side at its normal cross section. By such arrangement Aof the caliper leg 11 and indicating arm 26, a recess 27 isthus provided intermediatethe surface 28 of the indicating arm 26a and the side 13 of the reduced end 12. vThe supplemental leg 25 also in cludes the engaging point 30 which extends outwardly from the pivotal connection 26, being greater in cross section than the cross section of the indicator arm 26a and of such construction that it curves in compound manner'outwardly and in the direction of the side 31 of the caliper, being the side opposite the side 14,"and having the rounded- 'same planeof movement. It is to be further noted that whereas themain callperv leg-ll'is shorterthan the caliperleg 10, the additional length provlded by the en-v gaging portion 30 provldes that both of the engaging pointsll and 30'will contact on the same curve or arc struck. from the pivot of the legs 10 and 11. p In order toV insure, that the supplemental -leg 25;,willfat. all times return to the same position a spiral spring 35 is disposed in l the recess 27 intermediate' the indicator arm 26a and the reduced end 12 of the caliper leg ,11 and preferably coiled' about the pivot 26, having oneend 36 thereof engaging the indicator arm 26?l and the opposlte end 37 engaging the vreduced end'12 of the caliper legll. The tendenc of the. sprlng 1s to normally force thein icator arm 26'toward thev caliperA leg 10, and similarly to force leg upon 'the'pivot 26, vmovementA of the .indicator arm 26Ltowardl vthe engaging pointl 30 outwardly from they caliper-leg 10 by .rocking the supplemental However, the

the caliperleglO islimited by a stop 38. po-

;'sitionedupon the side 14. ofthe caliper leg 1l, and projectin cali upwardly to engage the free terminalof t e indicator arm 26.

The free end 3 9 of the indieatorarm 26,

is pointed and adapted'to cooperate with the graduations 40 struck upon thel side 14 of the caliper leg 11, thus providing a micrometer adjustment. In order to determine the dimension of an Y vSallie bev correct' or there is a discrepanc therein, the calipers legs 10 and 11A are adx-l justed by the screw 2 1 to their required ga in such manner that the point 39 o t e indicator a-rm 26 coincidesf'with the 'relatively large graduation mark` 41'upon the er legll, as is clearly shown in Figure 1v o the drawings, the accurate or the set gage, then being the distance between the engaging Cpoints 11 and 30 of le s 10 an 11` res ectively. In determinin w ether an articlp the set gage, the calipers are applied thereto and if the dimension is smaller-than the set gage, the engaging point 30 will be somewhat depressed,

point 39 and relatively rockin the indicator arm upon the pivot 26 and vorcing the point 39 outwardly from the relatively long graduation 41 and the distance between the long graduation 41 will total the v arian'cel between -the set gage and thel smaller dimensions as is clearly shown in Figure2 of the-drawings. However, if the article or object to be measvof caliper legs, one of and sprin r facing sur -of caliper legs,

an en aging point adapted t object,""'whether the the caliper' e or object will register` tionedengaging ured has a dimension lwhich isjlarger than the set gage, then the point 39 will of course swing upon the opposite side of the relatively long graduation mark 41, and the number of graduations -intermediate the point 39 and long graduation mark 41 will `invention herewith shown and described 1s to be taken as a preferred example of the same and that various changes in the shape, size and lformation of parts may be made without departing from the splrit of the invention claims.

I claim: 1. In a caliper the combination, of a pair said legs havin an engaging point thereon, asupplementa leg pivoted to the second of said legs and havmgan engaging point adapted to cooperate with said first vmentioned engagin point, means disposed lintermediate the aces of said supplemental leg and said second mentioned caliper l or the Vscope of 4lthe subjoined.

for normally lforcing said supplemental eg'engaging` point in one direction.

2. In a caliper,.the combination, of a pair engaging point pivoted to the second of said thene`on,. a supplementa legs and havin o cooperate wit said rst mentioned en aging point, and a spring coiled about sai ivot, and engagingthe supplemental leg or normally forcing the supplemental leg engaging point in one direction. l,

3. In a caliper, the combination of a pair of caliper legs, one of said legs having .an engaging point thereon, the second of said legshaving the free end thereof reduced in crosssectionfby'the cutting away of one side below the common plane of said side, a supplemental leg pivoted to said second mentioned leg adjacent the free end and facing the re uced side thereof, said suppleone of said llegs havin anl v leg.

mental leg comprising an engaging point adapted to cooperate with said first menpoint and an indicator arm adapted to overlle in abutting engagement the side -of said second. leg at its normal cross section and providing a space intermediate the indicator arm and reduced side of the caliper leg, and s ring means disposed withm said space an engaging said indicator arm for normally forcing the same 1n one direction.

l 4. In a caliper, the combination, of a pair i of caliper legs, one vof said legs having an enga ing point thereon, the second of said legs aving the free end thereof reduced in cross section vby the cutting away of onev Side below the common plane of said side, a, supplemental leg pivoted to said second mentioned leg, and near the end thereof in facing relation to the reduced side thereof, said supplemental leg comprising an engaging point adapted to cooperate with said l'st mentioned engaging point and an indie cator arm adapted to overlie in abutting EDWARD CICHY. RUDOLF PESEK. 

